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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b602db6fa47543d7b0f7bc811bd45ff9d718f48c0b2feeb502177df99b3fb244' 
  AND token = 'bV5XFBinwg9q56/4b3qYUBYztgXursdsF3BMBWE8Dhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}